path.fit()

將 Path 塞到另一個 CGRect 中。

// ⭐️ required:
//    - 🅿️ Vector2D
//    - 🌀 Path + transform

import SwiftUI
import VectorSpace  // for `-v` additive inverse

extension Path {
    // path.fit(in: rect)
    public func fit(in rect: CGRect) -> Path {
        // scale factors
        let x = rect.width  / boundingRect.width
        let y = rect.height / boundingRect.height
        // fit self into rect
        return self
            .translate(-boundingRect.origin)   // 🅿️ Vector2D, 🌀Path + transform
            .dilate(x, y)                      // 🌀Path + transform
            .translate(rect.origin)
    }
}

/*
 * ⭐️ required: 
 *    - 🌀Path + fit
 *    - 🅿️ Vector2D
 *    - 📦 Fit
 */

import SwiftUI
import PlaygroundSupport

// paths

let balloon = Path { p in
    p.move        (to: [ 50,   0])        // 🅿️ Vector2D
    p.addQuadCurve(to: [  0,  50], control : [  0,   0])
    p.addCurve    (to: [ 50, 150], control1: [  0, 100], control2: [ 50, 100])
    p.addCurve    (to: [100,  50], control1: [ 50, 100], control2: [100, 100])
    p.addQuadCurve(to: [ 50,   0], control : [100,   0])
}

let square = Path { p in
    p.move(to: [50, 50])
    p.addLines([[100, 50], [100,100], [50, 100], [50, 50]])
    p.closeSubpath()
}

let diamond = Path { p in
    p.move(to: [50, 50])
    p.addLines([[100, 100], [50,150], [0, 100], [50, 50]])
    p.closeSubpath()
}

diamond.boundingRect

// live view
struct ContentView: View {
    var body: some View {
        HStack {
            Group {
                Fit(balloon)                          // 📦Fit
                Fit(square)
                Fit(diamond)
                diamond
                    .fit(in: CGRect(50, 0, 50, 100))  // 🌀Path + fit
                    .stroke()
            } // Group
                .overlay(Rectangle().stroke(Color.gray, style: .init(dash: [6])))
        } // VStack (container)
            .padding()
            .border(Color.gray, width: 3)
            .frame(height: 200)
    }
}

PlaygroundPage.current.setLiveView(ContentView())

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Last updated 2 years ago